Method of forming stencil-character punches and dies



Aug. 19 1924 1,505,336

S. D. HARTOG METHOD OF FORMING STENCIL CHARACTER PUNCHES AND D IES Filed Jan. 23, 1922 s \v M1 1 8/7 for.

Patented Aug. 19, 1924.

UNITED STATES STEPHEN D. rmnroe, or BELLEVILLE, ILLrNors, ASSIGNOR TO JOHN w. MARSH, or

BELLEVILLE, ILLINOIS. 7

METHOD OF FORMING STENCIL CI-IARACTER PUNCHES AND DIES.

" Application filed January 23', 1922. Serial No. 531,024.

T all whom, it may concern: I

Be it known that I, STEPHEN D. HARTOG, a citizen of the United States, residing at Belleville, St. Clair County, and State of Illinois, have invented a new and useful Method of Forming Stencil-Character Punches and Dies, of which the following is a specification.

This invention relates to an improved method of forming stencil character punch and dies, and consists in the novel method hereinafter disclosed.

An object of the invention is to provide a method whereby stencil character punch and dies may be formed from a master punch and die in such a way as to produce efficient cutting edges on the punch element adapted for cooperation with die elements formed from the same master punch and die.

Further advantages of the novel method will be understood from the following detailed disclosure, taken in connection with the accompanying drawing in which- Fig. 1 is a perspective view of the master punch and die.

Fig. 2 is a view of the die element formed from the master punch and die, illustrating the same as it is taken from the master die.

Fig. 3 is a vertical section of the punch plate and illustrates the first step of forming the same.

Fig. l is the second step in the formation of the punch plate.

Fig. 5 is a vertical section ofthe punch plate finished.

Fig. 6 is a plan view of the finished punch late. p Fig. 7 is a reverse view of the die plate.

Fig. 8 illustrates the material punched from the die plate in the formation thereof.

In practicing the method of the invention the punch and die plates are formed from a single master punch and die. The master die 1 is mounted in a die block 2, the character 3 to be formed in the punch and die plates being raised in the face of the master die. The master punch 4 is carried by a punch spindle 5.

In forming the die blank the plate is out out in the usual manner, resulting in a rounded corner at 6 at the top of the plate as the same leaves the master die, and a sharp edge 7 at the inner face. The plate is then reversed so as to present the sharp edge 7 to the punch eIemenb of the stencil cutting machine, the edge 7 tapering slightly out wardly.

In the formation of the punch element the plate is placed over the master die andthe punch depressed, so that the cut-out portion 8 is pressed part way through the thickness of the punch plate 9. This operation forms a rounded corner 10 on the cut-out character and a sharp cutting edge 11 on the upper face of the characteras the same leaves the die. The cut-out portion is then driven backwardly, as illustrated in Fig. 4, so that the top and bottom face of the cut-out character are in the same horizontal plane with the punch plate.

By reversing the punch plate and again depressing the master punch over the punch plate and the master die, the cut-out portion is driven downwardly so as to force the character outwardly from what was originally the top face of the plate. The space left below from the elevation of the material PATENT OFFICE.

forming the cut-out character is then filled in by a quantity of solder 12, thus securing the cut-out character in raised position above the top face of the punch plate.

It will be noted that this method presents the sharp cutting edge 11 so that when the stencil cutting mechanism is operated the sharp cutting edge 11 will enter the slightly outwardly-flared edge 7 of the die plate.

Fig. 8 merely represents the waste material or cut-out part of the die plate.

Obviously, a stencil cutting punch and die formed in the method described may be conveniently produced from a single master punch and die. The finished punch and die plates are matched for cooperative relation ship so that the cutting edges of both the punch and die plates cooperate to perform a clear incisive cut in'the stencil material,

the. clearance between the edges of the punch 2. The m thod. of forming stenc l cutting same plate; forcing the cut out portion above the original upper plane of the same plate; and securing the cut out portion of the same plate in raised position.

3. The method of forming a stencil cut- 4 ting punch plate, Which consists in punching a character in the plate; forcing the metal of the cut out portion partially through the thickness of the metal of, the

plate; reversing the plate; and forcing the metal of the cut out portion to a plane alcove the original upper face of the same plate to present a sharp edge of the raised portion.

at. The method of forming a stencil cut ting punchplate, Which consists in punching a die plate to form a stencil character; forcing the material of the stencil'charac'ter a part of the Way through the plate in one direction; and then forcingthe stencil char acter a part of the Way through the die plate in the opposite direction.

5. The method of forming a stencil cutting punch plate, which consists in punching a die plate to form a stencil character;

forcing the material of the stencil character a part of the Way through the plate in one direction; then forcing the stencil character a part of the Way through the die plate in the opposite direction; and filling thecharacter space in the die plate after the stencil character has been forced to said last position.

STEPHEN D. HARTOG. 

